If you have a finite number of values and they aren't going to change, you can get away with using a standard array instead of a vector.

This is only if you have a static amount of values and performance is an issue. If performance doesn't matter, use a vector as suggested from niek_e since you get the perks of a dynamic array as well as information about its size and the ability to use STL algorithms with it to manipulate, copy or iterate through its contents... etc.